refactor(magic-rewrite): prepare V1 for review

[cha1latte]

Linked issue

Refs #1183
Refs #1238

Why this change

PR #1238 contains the Magic Rewrite V1 feature, but the branch was based on main while targeting staging, which pulls unrelated tracker/composer/changelog work into the review diff.

This cleanup branch replays the Magic Rewrite work onto staging and separates the first server/client seams so the feature is easier to review and refactor without changing the intended V1 behavior.

What changed

• Replayed the Magic Rewrite V1 surface onto upstream/staging.
• Kept the editor integrations for expanded textareas and lorebook entry content.
• Moved Magic Rewrite generation logic into packages/server/src/services/magic-rewrite/magic-rewrite.service.ts.
• Kept packages/server/src/routes/magic-rewrite.routes.ts focused on request validation and HTTP response handling.
• Moved Magic Rewrite client request/localStorage/loading/error state into packages/client/src/hooks/use-magic-rewrite.ts.
• Preserved existing config-error behavior as 400 responses.

Validation

• pnpm check passes locally
• Container (Docker / Podman) built and ran without issue
• Ran the app, clicked through the changes manually
• Checked edge cases (light + dark mode, mobile viewport, empty states, error paths)
• Above manual verification completed (describe below)
• Read and followed CONTRIBUTING.md

Manual verification notes

• Codex ran pnpm check successfully in C:\tmp\marinara-pr-1238.
• Codex ran git diff --check successfully.
• Codex ran a Bunny maintainer-equivalent pass for branch/base, scope, logging, and proof quality.
• Codex smoke-tested the Magic Rewrite UI locally in browser from the expanded character description editor.
• Codex smoke-tested the Magic Rewrite UI locally in browser from a lorebook entry content editor.
• Provider-runtime verification is still pending: test Generate Rewrite with a configured text LLM connection.

Docs and release impact

• No docs changes needed
• Updated docs (README / CONTRIBUTING / android/README / CHANGELOG) as needed
• Version/release files updated (only if this PR includes a version bump)

UI evidence (if applicable)

Character editor Magic Rewrite panel:

Lorebook entry Magic Rewrite panel:

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[cha1latte]

closing accidentally had this on staging